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Update bash-gotchas.md

David Stark committed 2021-06-28 21:46:49 +0100 commit a5f04639e39b0095c27d04de7687e0603ac2a013

				compute/bash-gotchas.md
			
          @@ -2,7 +2,7 @@

           This kind of shit is why sysadmins drink.

           ### (( )) can return false 

          -[Iff](https://en.wikipedia.org/wiki/If_and_only_if) the expression in `(( blah ))` evaluates to <0, the `(( ))` returns false, so your `set -e` script will fall on its arse. Best of luck to you.

          +[Iff](https://en.wikipedia.org/wiki/If_and_only_if) the expression in `(( blah ))` evaluates to <0, the `(( ))` returns false, so your `set -e` script will fall on its arse.

           ### pipes into read can return false for no reason

           In some old versions of bash (e.g. RHEL6), piping commands into `while read -r blah` from the left will return false unchecked at the end of the stream, so `set -e` will make a mockery of you.

...	...	@@ -2,7 +2,7 @@
2	2	This kind of shit is why sysadmins drink.
3	3
4	4	### (( )) can return false
5		-[Iff](https://en.wikipedia.org/wiki/If_and_only_if) the expression in `(( blah ))` evaluates to <0, the `(( ))` returns false, so your `set -e` script will fall on its arse. Best of luck to you.
	5	+[Iff](https://en.wikipedia.org/wiki/If_and_only_if) the expression in `(( blah ))` evaluates to <0, the `(( ))` returns false, so your `set -e` script will fall on its arse.
6	6
7	7	### pipes into read can return false for no reason
8	8	In some old versions of bash (e.g. RHEL6), piping commands into `while read -r blah` from the left will return false unchecked at the end of the stream, so `set -e` will make a mockery of you.